Frequency Doubler with 4011

This is a circuit of Frequency Doubler using 4011. This circuit uses one CMOS quad, two input NAND gate package type 4011. This circuit consist of two differentiating networks R1/C1, R2/C2, an inverter IC1B and NAND gate IC1A, IC1D, IC1C and  function as input and output buffers. Figure below shows the schematic diagram of the circuit and the pulses in […]

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12V Car Battery Charger

This is 12V Car Battery Charger simple circuit. This circuit is designed to solve some problems that occurs in most car battery chargers. The problem that occur in most car battery chargers is when the charger is not turned off, the battery will overcharge, the plate of the  charger will destroyed and the electrolyte of the charger will lost because […]

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7.5V Uninterruptible Power Supply

This is 7.5V Uninterpretable Power Supply simple circuit. This circuit was used in many applications as a battery backup for low power requirements. This circuit contains a bridge rectifier, an electrolytic capacitor,  and a transformer followed by a Zener controlled series pass transistor. This circuit can generate +7.5V stable output. Here is the circuit: The stand-by battery, 7.5V, is connected […]

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Kirchoff’s Voltage Laws – Video Tutorial

This is a Kirchoff’s voltage laws video tutorial. This video describes Kirchoff’s voltage laws and how to use it. There two Kirchoff’s laws, they are Kirchoff’s voltage laws and Kirchoff’s current laws. In Kirchoff’s current laws, each node contains sum of input current is same with sum of output current. Kirchoff’s voltage laws tells each loop in the circuit, sum […]

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Current and Voltage – Video Tutorial

This is a video tutorial about current and voltage. This video describes the basic in electricity. In this video, the electricity analogous as river. The fundamental quantity in the river is how much the current flowing. The symbol of the current is I and measured in coulomb per second. Coulomb per second is given special name, the name is Amp. […]

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